It's about leaving people wanting to know more and encouraging conversation with them.
Facebook has made recent changes to the algorithm that favours "meaningful conversations."
This means if your posts are creating comments, questions and responses- it will be shown higher in the newsfeed.
This can't happen when you give someone everything they need to know. They have no reason to respond to your post.
Put it this way...
Here's what it's not:
Meeting someone for the first time and before you even introduce yourself you're straight into a sales spiel.
You instantly begin telling them everything about your business.
Pricing, products, monthly specials- the whole shebang.
Before they can even get a word in,
you hand them your business card and leave.
How rude right?
Telling people everything about your product/service on social media without introducing yourself and asking them anything about them, is pretty much...